src/platforms: move all headers to platforms/common/include/px4_platform_common

and remove the px4_ prefix, except for px4_config.h.

command to update includes:
for k in app.h atomic.h cli.h console_buffer.h defines.h getopt.h i2c.h init.h log.h micro_hal.h module.h module_params.h param.h param_macros.h posix.h sem.h sem.hpp shmem.h shutdown.h tasks.h time.h workqueue.h; do for i in $(grep -rl 'include <px4_'$k src platforms boards); do sed -i 's/#include <px4_'$k'/#include <px4_platform_common\/'$k/ $i; done; done
for in $(grep -rl 'include <px4_config.h' src platforms boards); do sed -i 's/#include <px4_config.h/#include <px4_platform_common\/px4_config.h'/ $i; done

Transitional headers for submodules are added (px4_{defines,log,time}.h)

src/lib/systemlib/conversions.c

@@ -37,7 +37,7 @@
  * Implementation of commonly used conversions.
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <float.h>
 
 #include "conversions.h"

src/lib/systemlib/cpuload.c

@@ -39,7 +39,7 @@
  * @author Lorenz Meier <lorenz@px4.io>
  * @author Petri Tanskanen <petri.tanskanen@inf.ethz.ch>
  */
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 
 #include <sys/types.h>
 #include <stdint.h>

src/lib/systemlib/err.h

@@ -65,7 +65,7 @@
 #ifndef _SYSTEMLIB_ERR_H
 #define _SYSTEMLIB_ERR_H
 
-#include <px4_log.h>
+#include <px4_platform_common/log.h>
 #include <stdarg.h>
 #include <errno.h>
 #include <stdlib.h>

src/lib/systemlib/hardfault_log.h

@@ -35,7 +35,7 @@
 /****************************************************************************
  * Included Files
  ****************************************************************************/
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <systemlib/px4_macros.h>
 
 /****************************************************************************

src/lib/systemlib/mavlink_log.cpp

@@ -39,7 +39,7 @@
  */
 
 #include <drivers/drv_hrt.h>
-#include <px4_posix.h>
+#include <px4_platform_common/posix.h>
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>

src/lib/systemlib/otp.c

@@ -43,7 +43,7 @@
  *
  */
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 #include <board_config.h>
 #include <stdio.h>
 #include <math.h>

src/lib/systemlib/print_load_posix.c

@@ -39,7 +39,7 @@
  * @author Lorenz Meier <lorenz@px4.io>
  */
 
-#include <px4_posix.h>
+#include <px4_platform_common/posix.h>
 
 #include <unistd.h>
 #include <string.h>

src/lib/systemlib/printload.h

@@ -41,7 +41,7 @@
 
 #pragma once
 
-#include <px4_config.h>
+#include <px4_platform_common/px4_config.h>
 
 #include <stdint.h>